backend/decode/Decoder.scala: modify `isBr` to include jal and jalr

src/main/scala/xiangshan/backend/decode/Decoder.scala

@@ -21,8 +21,10 @@ class Decoder extends XSModule with HasInstrType {
   val decodeList = ListLookup(instr, Instructions.DecodeDefault, Instructions.DecodeTable)
   val instrType :: fuType :: fuOpType :: Nil = decodeList
 
-  // todo: remove this when fetch stage can decide if an instr is br
-  io.out.cf.isBr := (instrType === InstrB)
+  // todo: remove this when fetch stage can decide if an instr is br/jmp
+  io.out.cf.isBr := (instrType === InstrB ||
+                    (fuOpType === BRUOpType.jal && instrType === InstrJ && fuType === FuType.bru) ||
+                    (fuOpType === BRUOpType.jalr && instrType === InstrI && fuType === FuType.bru))
 
 //  val isRVC = instr(1, 0) =/= "b11".U
 //  val rvcImmType :: rvcSrc1Type :: rvcSrc2Type :: rvcDestType :: Nil =